Investor · Chicago, IL

Warren Holtsberg

Open Warren in the network graph →

Filings

4

SEC Form D

Connections

52

co-filers

Capital

—

across filings

Active

Mar 2009

to Mar 2026

Most-connected co-filers (52)

Robert Schultz · Santa Barbara, CA4 shared Michael T. Tokarz · New York, NY4 shared John Banta · Champaign, IL4 shared James J. Foght · New York, NY4 shared Ravishankar K. Iyer · Chicago, IL4 shared Kathryn Burrer Hyer · Chicago, IL4 shared William Tai · Chicago, IL4 shared Andrews Capital Management Corporation · Houston, TX2 shared Itzik Cohen · Campbell, CA2 shared Gary Simon · Westwood, MA2 shared Mark Little · Watertown, MA2 shared Margaret M. Conklin · New York, NY2 shared John F. O'Connor · New York, NY2 shared Vince Vannelli · Campbell, CA2 shared Bronson Lingamfelter · New York, NY2 shared David Mooney · Lincoln, RI2 shared Glenn J. Hill · NEW YORK, NY2 shared Richard Balance · Indian Wells, CA2 shared John Regan · CHICAGO, IL2 shared David Rose · New York, NY2 shared Richard Berenson · WABAN, MA2 shared John Roberts · Austin, TX2 shared Arthur Goldstein · Watertown, MA2 shared John C. Cerulli · Westwood, MA2 shared

Recent filings (4)

CU DIRECT CORPMar 2026 · 18 co-filers$7.0M CU DIRECT CORPDec 2025 · 54 co-filers$21.1M Illinois Emerging Technologies Fund II, LPApr 2010 · 20 co-filers$60.0M Illinois Emerging Technologies Fund II, LPMar 2009 · 20 co-filers$60.0M

Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Warren in the interactive graph →